Add town cargo patch SLXI/PATX code.

Update setting string.

src/lang/english.txt

@@ -1561,7 +1561,7 @@ STR_CONFIG_SETTING_TOWN_FOUNDING_HELPTEXT                       :Enabling this s
 STR_CONFIG_SETTING_TOWN_FOUNDING_FORBIDDEN                      :Forbidden
 STR_CONFIG_SETTING_TOWN_FOUNDING_ALLOWED                        :Allowed
 STR_CONFIG_SETTING_TOWN_FOUNDING_ALLOWED_CUSTOM_LAYOUT          :Allowed, custom town layout
-STR_CONFIG_SETTING_TOWN_CARGO_FACTOR                            :{LTBLUE}Town cargo generation factor (less < 0 < more): {ORANGE}{STRING2}
+STR_CONFIG_SETTING_TOWN_CARGO_FACTOR                            :Town cargo generation factor (less < 0 < more): {STRING2}
 
 STR_CONFIG_SETTING_EXTRA_TREE_PLACEMENT                         :In game placement of trees: {STRING2}
 STR_CONFIG_SETTING_EXTRA_TREE_PLACEMENT_HELPTEXT                :Control random appearance of trees during the game. This might affect industries which rely on tree growth, for example lumber mills

src/saveload/extended_ver_sl.cpp

@@ -45,6 +45,7 @@ std::vector<uint32> _sl_xv_discardable_chunk_ids;           ///< list of chunks
 static const uint32 _sl_xv_slxi_chunk_version = 0;          ///< current version os SLXI chunk
 
 const SlxiSubChunkInfo _sl_xv_sub_chunk_infos[] = {
+	{ XSLFI_TOWN_CARGO_ADJ, XSCF_IGNORABLE_UNKNOWN, 1, 1, "town_cargo_adj", NULL, NULL, NULL },
 	{ XSLFI_NULL, XSCF_NULL, 0, 0, NULL, NULL, NULL, NULL },// This is the end marker
 };
 

src/saveload/extended_ver_sl.h

@@ -21,6 +21,7 @@
  */
 enum SlXvFeatureIndex {
 	XSLFI_NULL                          = 0,      ///< Unused value, to indicate that no extended feature test is in use
+	XSLFI_TOWN_CARGO_ADJ,                         ///< Town cargo adjustment patch
 
 	XSLFI_SIZE,                                   ///< Total count of features, including null feature
 };

src/table/settings.ini

@@ -766,6 +766,7 @@ max      = +8
 interval = 1
 str      = STR_CONFIG_SETTING_TOWN_CARGO_FACTOR
 strval	 = STR_JUST_INT
+patxname = ""town_cargo_adj.economy.town_cargo_factor""
 
 ; Vehicles